CVE-2023-28771
KEVCRITICAL 9.8EPSS 99.3%
Improper error message handling in Zyxel ZyWALL/USG series firmware versions 4.60 through 4.73, VPN series firmware versions 4.60 through 5.35, USG FLEX series firmware versions 4.60 through 5.35, and ATP series firmware versions 4.60 through 5.35, which could allow an unauthenticated attacker to execute some OS commands remotely by sending crafted packets to an affected device.
- Affected
- Zyxel · ZyWALL/USG series firmware · VPN series firmware · USG FLEX series firmware · ATP series firmware
- CVSS v3.1 NVD
- 9.8 CRITICAL
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - EPSS
- 99.28% chance of exploitation in the next 30 days, 100th percentile
- CISA KEV
- added 2023-05-31
- Published
- 2023-04-25
- Updated
- 2025-10-21
Proof-of-concept exploits (6)
- http://packetstormsecurity.com/files/172820/Zyxel-IKE-Packet-Decoder-Unauthenticated-Remo…
- BenHays142/CVE-2023-28771-PoC30★ · 2023-05-23
- JinParkmida/cve-2023-28771-demo0★ · 2025-07-22
- benjaminhays/CVE-2023-28771-PoC30★ · 2023-05-23
- fed-speak/CVE-2023-28771-PoC30★ · 2023-05-23
- getdrive/PoC73★ · 2024-08-12